Proper Installation Of Roof Underlayment

It s not ideal to install roof underlayments when the temperature is under 40 degrees f as it won t ensure a proper fit.

Proper installation of roof underlayment.

Overlap each row at least 3 to 4 inches. If you live in an area with inclement weather you should consider using a special ice and water protector. Underlayment flashings and shingles all work together and must be installed in the correct order. Press the membrane of the self adhering roofing underlayment in place with heavy hand pressure to ensure the desired adhesion to the roof deck.

The best time for installing roof underlayment is when the temperature is between 40 to 85 degrees fahrenheit. Fasten drip edge on eaves with. Inspect the underlying roof sheathing for damage and make any needed repairs. Install the drip edge on the gable ends of the roof after you finish installing your underlayment.

Ideally the roof covering material would be installed as soon as possible but in reality the roof may be protected by only the underlayment for days weeks or sometimes months. Installing roof felt is a two person job. Use a tin snips to cut the drip edge to size. Roof underlayment prevents the roof deck from being exposed to the elements before or while the roofing material is being installed.

Start at the bottom side of the gable and overlap the sections of drip edge a few inches as you work your way up the roof see figure a. Hammer down any large nails that are exposed by the removal. It is important to apply pressure to secure adhesion to the deck and to smooth out any wrinkles in the membrane that may result in air channels or tears that could result in a failure. When going up the sloped edges of the roof called the rakes it goes on top of the underlayment.

Nail metal drip edge flashing which bends over the roof and down the edge of the facing board on all roof edges. Install a layer of roofing insulation as recommended by the roofing manufacturer. Start by laying asphalt felt or other underlayment over the roof. Using your staple gun secure the felt to the roof.

Do not use felt as a temporary protection against rain. Synthetic roofing underlayment is to be laid horizontally parallel to eave with printed anti slip side up starting at the bottom of the lowest roof eave with a 1 5 underlayment overhang at the eave covering the pre installed eave drip edge. Overhang the roof rake edge 1 5 and cover the underlayment with a metal rake edge trim. If it gets wet it will wrinkle making it harder to shingle.

Although this seems to contradict the overlapping principle installing the drip edge over the underlayment at the rakes creates a clean roof edge and provides the underlayment attachment with increased resistance against wind uplift.